/*
 * Copyright (C) 2015 Square, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package cn.nexd.app.okhttp.internal.http;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * An exception thrown to indicate a problem connecting via a single Route. Multiple attempts may
 * have been made with alternative protocols, none of which were successful.
 */
public final class RouteException extends Exception {
    private static final Method addSuppressedExceptionMethod;

    static {
        Method m;
        try {
            m = Throwable.class.getDeclaredMethod("addSuppressed", Throwable.class);
        } catch (Exception e) {
            m = null;
        }
        addSuppressedExceptionMethod = m;
    }

    private IOException lastException;

    public RouteException(IOException cause) {
        super(cause);
        lastException = cause;
    }

    public IOException getLastConnectException() {
        return lastException;
    }

    public void addConnectException(IOException e) {
        addSuppressedIfPossible(e, lastException);
        lastException = e;
    }

    private void addSuppressedIfPossible(IOException e, IOException suppressed) {
        if (addSuppressedExceptionMethod != null) {
            try {
                addSuppressedExceptionMethod.invoke(e, suppressed);
            } catch (InvocationTargetException ignored) {
            } catch (IllegalAccessException exception) {
                
            }
        }
    }
}
